30139237 has 2 divisors, whose sum is σ = 30139238. Its totient is φ = 30139236.

The previous prime is 30139229. The next prime is 30139261. The reversal of 30139237 is 73293103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29582721 + 556516 = 5439^2 + 746^2 .

It is a cyclic number.

It is not a de Polignac number, because 30139237 - 2³ = 30139229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30139297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15069618 + 15069619.

It is an arithmetic number, because the mean of its divisors is an integer number (15069619).

Almost surely, 2^30139237 is an apocalyptic number.

It is an amenable number.

30139237 is a deficient number, since it is larger than the sum of its proper divisors (1).

30139237 is an equidigital number, since it uses as much as digits as its factorization.

30139237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 30139237 is about 5489.9214019875. The cubic root of 30139237 is about 311.2032218427.

The spelling of 30139237 in words is "thirty million, one hundred thirty-nine thousand, two hundred thirty-seven".